Dependability Modelling and Sensitivity Analysis of Scheduled Maintenance Systems
EDCC-3 Proceedings of the Third European Dependable Computing Conference on Dependable Computing
Joint Evaluation of Performance and Robustness of a COTS DBMS through Fault-Injection
DSN '00 Proceedings of the 2000 International Conference on Dependable Systems and Networks (formerly FTCS-30 and DCCA-8)
DEEM: A Tool for the Dependability Modeling and Evaluation of Multiple Phased Systems
DSN '00 Proceedings of the 2000 International Conference on Dependable Systems and Networks (formerly FTCS-30 and DCCA-8)
Dependability Modeling and Evaluation of Phased Mission Systems: A DSPN Approach
DCCA '99 Proceedings of the conference on Dependable Computing for Critical Applications
On Evaluating the Performability of Degradable Computing Systems
IEEE Transactions on Computers
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To ensure the consistency of database subsystems involved in communication systems (e.g., telephone systems), appropriate scheduled maintenance policies are necessary. Audit operations, consisting in periodic checks and recovery actions, are typically employed in databases to cope with run time faults which may affect the dependability and quality of service of the overall system. This paper aims at investigating on appropriate tuning of audit operations, so as to find optimal balances between contrasting requirements, namely satisfactory database availability and low overhead due to audits. For this purpose, a methodology to analyse the behaviour of the database under scheduled maintenance is here suggested. Analytical models, essentially based on Deterministic and Stochastic Petri Nets (DSPN), are defined and analysed, in terms of dependability indicators. A sensitivity analysis wrt to the most affecting internal and external parameters is also performed on a case study.